A 是工资总数
B 是 "dental+HSA savings +Medical insurance + Vision" + "Group term life insurance"
所以， SSA上的数就比全年收入数小了。
写的更清楚点：
A (一年工资数） - B (dental+HSA savings +Medical insurance + Vision) + C (Group term life insurance)
==your taxed medicare earnings (show in SSA statement)
太高兴了， 又搞懂一点了。
谢谢
